Resources which are found in a region, but have not been utilised are termed as potential resource. They are either not easily accessible or not properly developed for present use but have the potential to fulfil our needs whenever we require them with development of technology and infrastructure. For example, the states of Rajasthan and Gujarat have enormous potential for development of wind and solar energy, but they have not been significantly developed yet. Similarly, the hot springs of Himalayan region have potential for development of geothermal energy but their development is lacking. Mineral deposits lie buried in mountains and oceans but their exploitation is lacking. Stocks, on the other hand, are materials in the environment which have the capacity to satisfy human needs but human beings do not have the appropriate technology to access these. For example, water is a compound of two inflammable gases, hydrogen and oxygen, which can be used as a rich source of energy. But the required technical knowhow to use these abundant gases for this purpose is not available at present. Similarly, by development of desalinisation project we can make ocean water usuable for drinking purpose. But we do not have the proper expertise and funds to use them, but our future generations may be able to do so with advancement of science and technology.